@fidel Yes, I briefly read about it, but it doesn't make much sense, I have my own gpg key and can encrypt it whenever I need and want.
Also, I had a conversation with a proton mail user and I recieved email from them encrypted, however I couldn't reply back with encryption, because it seems proton doesn't expose pgp public key via WKD (it could be related to additional setup not done on custom domain).
@abcdw Not that you want to, but Protonmail supports using your own PGP private keys: https://proton.me/support/importing-openpgp-private-key
Protonmail aims to make encrypted email easy, but that means that you are probably not their target audience.